I think i spent so much effort trying to reduce hum that i totally ignired hiss. Never had an amp that could amplify it that much. Weird tjing is is that sometimes i switch it on an play and the hiss is terrible. Other times i have almost no hiss. Its still a great amp. I put a valvecaster eith a 12at7 and the vibracaster mod. That goes through the GGG digital reverb, then throguh the 12au7 preamp and into the lm3886. Wish i had put a JFET buffer and a 1 meg pot in front of the pwer amp. The thing is so loud and all i can control is the gain of the preamp an not the volume. 8 knobs already tho. Not much room for another.
